Improvement in gas-pumps



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ms PM 7925 ML WELLS,

PATENTED Ave 81871 4466;?! awed? UNITED STATES PATENT OFFICE.

WILLIAM H. POLLARD, OF SENECA FALLS, NEW YORK, ASSIGNOB TO THE GOULDS MANUFAOTU RING COMPANY, OF SAME PLACE.

IMPROVEMENT IN GAS-PUMPS.

Specification forming part of Letters Patent No. 117,925, dated August 8, 1871.

To all whom it may concern:

Be it known that 1, WILLIAM H. POLLARD, of Seneca Falls, in the county of Seneca and State of New York, have invented a certain new and useful Improvement in GasPumps for Oil-Wells; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawing, in whic'h- Figure 1 represents a perspective view of my improved pump with a portion of the side chamber broken away and with one of the valve-casings removed from place, Figs. 2 and 3, detail views.

Like letters of reference indicate corresponding parts in all the figures.

Thisimprovement is applicable to any ordinary use where a double-actin g pump is required, but it is specially designed for drawing off the gas from the casing of oil-wells and conducting the same to the furnace of the engine. For this pur pose it is necessary to have tight joints to the pump; and the invention consists in the construction of the side chamber of the cylinder and the valve-casing, as hereinafter described, with this special purpose in view.

In the drawing, A represents the base of the pump; B, the cylinder O, the cap or top of the pump; and D,the piston. These parts, in general arrangement, are the same as those in use in ordinary double-actin g pumps. On one side of the cylinder is cast a chamber, E, extending from top to bottom. This chamber is divided longitudinally by a partition, 0, which thus forms two longitudinal passages, b b, which have no direct communication with each other or with the cylinder. Lateral ports 0 c are made in the sides of these passages for the connection of the pipes which extend to the well and to the furnace. These passages b I) do not open at top and bottom into the interior of the cylinder, as in ordinary double-acting pumps, but open outward by ports (I d and thus communicate with similar ports (1 d of the valve-casings F, the construction of which will presently be described. By this arrangement the passages 12 b are made to communicate with a valve-casing bolted outside the pump, which is a distinguishing feature of my invention. Two of the valve-casings F F are used, one at the top and one at the bottom, and

they are simply bolted tightly in place against the planeseats ff, with only a packing between. These valve-casings are each cast in a single piece, and, besides, the ports (1 d before spoken of, have a central port, d which communicates with the interior of the cylinder by a similar port, (1 formed in the latter. These ports are shut off from the passages I) b, and the gas from the latter can reach them only by making the circuit through the hollow valvecasings. The valveeasings are each cast hollow and providedwith seats g g, on which strike the valves h h. The ports (1 (1 which open from the passages I) I), open one .over and the other under the valves 71 It, so as to produce a reverse action as the piston goes up and down; and the open spaces i i, above and below said valves, respectively, connect directly with a central space which forms a continuation of the central port (1 This construction (which is clearly shown in Fig. 2) consists simply of a web, which is cast entire in the hollow valve-casing, thereby allowing the free reverse action of the valves without any of the loose or open joints that occur where the valve-casing is made up of several separate and detached parts. In this improved construction there is but one joint to each end of the pump, and that is at the junction of the valve-casing with the seat f; all else, both of the side chamber and the valves, is inclosed by a solid construction; and hence there can be no essential escapeof the volatile gas as it passes through. The special construction of the valvecasings to produce this result I believe to be new. The stems of the valves h h rest in screw-sockets l l in the usual manner.

I am aware that it is common to cast a side chamber to a doubleacting pump to allow the medium to follow the action of the plunger. Such, in its broad sense, I do not claim. I claim only the special construction of my chamber, whereby the same is adapted to use with the valve-casings bolted upon the outside. In this connection the passages b I) must open outside, while in other pumps they open inside the cylinder. In the same manner I do not claim, broadly, locating the valves in a hollow casing, but only the special construction of the casing described, whereby the same is adapted to be bolted upon the outside. of the gaschamber, thereby making but a single joint at each end of the pump.

It will be noticed that there is not only an alternate action of each pair of valves in a single easing, but also a similar action in each pair situated in line at the top and bottom, thus producing a compound action which keeps up a continuous movement of the gas.

In a gas or air-pump it is essential, to get the full stroke of the piston, to leave none of the medium or fluid at either end at the reverse movement.

What'I claim as my invention, and desire to secure by Letters Patent, is

1. The chamber E, provided with the longitudinal partition a, forming distinct and separate passages 11 I), which have side ports 0 c for the attachment of the induction and eduction-pipes, and ports (1d at top and bottom opening outward into the valve-casings, as herein described.

2. The duplex valve-casings F, with the ports (1 d 61 opening respectively to the passages in the side chamber and to the cylinder, and provided with the seats g 9 so arranged as to admit the gas or other fluid over one valve and under the other, as herein described.

3. The combination and arrangement, with the cylinder B, of the outside chamber E provided with the seats ff of the valve-casings F F bolted thereon, in the manner and for the purpose specified.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

WM. H. POLLARD.

Witnesses:

CORNELIUS S. Hoon, R. N. HERBERT. 

